Northgrippian | |||||||||||||||
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Chronology | |||||||||||||||
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Etymology | |||||||||||||||
Name formality | Formal | ||||||||||||||
Name ratified | 14 June 2018[1][2] | ||||||||||||||
Usage information | |||||||||||||||
Celestial body | Earth | ||||||||||||||
Regional usage | Global (ICS) | ||||||||||||||
Time scale(s) used | ICS Time Scale | ||||||||||||||
Definition | |||||||||||||||
Chronological unit | Age | ||||||||||||||
Stratigraphic unit | Stage | ||||||||||||||
Time span formality | Formal | ||||||||||||||
Lower boundary definition | 8.2 kiloyear event | ||||||||||||||
Lower boundary GSSP | NGRIP1 ice core, Greenland 75°06′00″N 42°19′12″W / 75.1000°N 42.3200°W | ||||||||||||||
Lower GSSP ratified | 14 June 2018[1] | ||||||||||||||
Upper boundary definition | 4.2 kiloyear event | ||||||||||||||
Upper boundary GSSP | Mawmluh Cave, Meghalaya, India 25°15′44″N 91°42′54″E / 25.2622°N 91.7150°E | ||||||||||||||
Upper GSSP ratified | 14 June 2018[1] |
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In the geologic time scale, the Northgrippian is the middle one of three ages or stages of the Holocene Epoch or Series.[3][4][5][6] It was officially ratified by the International Commission on Stratigraphy in June 2018 along with the earlier Greenlandian and later Meghalayan ages/stages. The age takes its name from the North Greenland Ice Core Project (NorthGRIP).[4] The age began 8,276 BP (6326 BCE or 3854 HE), near the 8.2-kiloyear event, and goes up to the start of the Meghalayan, which began 4,200 BP (2250 BCE or 7750 HE), near the 4.2-kiloyear event.[7]